US5652509A - Device for determining the velocity of a longitudinally traveling elongate textile material, especially a yarn, using electronic sensors - Google Patents

Device for determining the velocity of a longitudinally traveling elongate textile material, especially a yarn, using electronic sensors Download PDF

Info

Publication number
US5652509A
US5652509A US08/533,071 US53307195A US5652509A US 5652509 A US5652509 A US 5652509A US 53307195 A US53307195 A US 53307195A US 5652509 A US5652509 A US 5652509A
Authority
US
United States
Prior art keywords
sensor
velocity
output characteristic
determining
yarn
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/533,071
Other languages
English (en)
Inventor
Manfred Weis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oerlikon Textile GmbH and Co KG
Original Assignee
W Schlafhorst AG and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W Schlafhorst AG and Co filed Critical W Schlafhorst AG and Co
Assigned to W. SCHLAFHORST AG & CO. reassignment W. SCHLAFHORST AG & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEIS, MANFRED
Application granted granted Critical
Publication of US5652509A publication Critical patent/US5652509A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G01P3/80—Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
    • G01P3/806—Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means in devices of the type to be classified in G01P3/68
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H61/00—Applications of devices for metering predetermined lengths of running material
    • B65H61/005—Applications of devices for metering predetermined lengths of running material for measuring speed of running yarns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a device for determining the velocity of an elongate textile material, in particular a textile yarn, traveling in longitudinally in its lengthwise dimension, wherein two sensors disposed at a predetermined spacing along the direction of traveling movement of the textile yarn produce measured sensor signals which are evaluated using a transit time correlator having a control loop circuit adjusted to a model delay time which corresponds to the actual transit time of a yarn section over the distance and the traveling velocity is calculated by a dividing element connected to the control loop circuit of the transit time correlator for determining a quotient, representing yarn velocity, from the distance and the model delay time.
  • a widely used method to determine the yarn length on such bobbin winding machines is to count the revolutions of the bobbin or of the drive roller for the bobbin and to determine the wound-on amount of yarn using calculations based on the circumference of the bobbin or of the drive roller for the bobbin. Since the circumference of the drive roller is constant, the determination of the circumferential velocity poses no problems. Nevertheless, the slippage which typically occurs between the drive roller and the bobbin can be a considerable source of errors.
  • the resultant calculated velocity or yarn length value may be greatly distorted since, to avoid so-called "pattern winding," a slippage between the drive roller and the bobbin is intentionally generated during the entire bobbin travel or at least in so-called pattern zones in which the bobbin diameter and the diameter of the drive roller have a defined relationship to each other.
  • a number of methods are known for determining the yarn velocity by contact with the yarn. Such a method increases the yarn tension and is unsuitable for higher re-spooling velocities because of the inertia of the element which is moved along with the yarn.
  • a device for determining the velocity of an elongate textile material, in particular a textile yarn, traveling longitudinally in its lengthwise dimension wherein two sensors are disposed at a predetermined distance along the direction of traveling movement of the textile yarn which produce measured sensor signals which are evaluated using a transit time correlator having a control loop circuit adjusted to a model delay time which corresponds to an actual transit time of a yarn segment over the predetermined distance, and that the velocity is calculated by a dividing circuit element connected to the control loop circuit of the transit time correlator, for obtaining a quotient from the predetermined distance and the model delay time.
  • the velocity determination device includes at least one first sensor g 1 including at least two signal receivers (1,2; 5,6; 9,10; 17,18; 25,26,27,28) disposed in sequence along the travel direction of the yarn, the first sensor g 1 having a sensor output characteristic curve which intersects the abscissa, indicating a zero instantaneous output value, on the effective sensor center axis, and wherein said output characteristic curve shows a point-symmetrical behavior at least in the vicinity of the intersection with the abscissa.
  • the present invention includes a second sensor g 2 having a steady state output characteristic curve waveform in the area of its effective sensor center axis, and a control loop circuit for the transit time correlator that includes means for using an undifferentiated cross-correlation function as the controller input signal for determining and readjusting an adjustment point for the model delay time ⁇ .
  • a differentiation of the cross-correlation function is no longer required with the present invention.
  • a point-symmetrical (at least in the vicinity of the adjustment point) function is employed for determining the adjustment point which utilizes the main advantage of the closed loop correlation over the open loop correlation.
  • the adjustment point which results with a time displacement over a model delay time ⁇ , which corresponds to the actual transit time T of a yarn section over the distance L between two sensors, is located on the intersection of the cross-correlation function with the abscissa, in other words, the minimum value of the cross correlation function.
  • the first sensor g 1 has a point-symmetrical output characteristic curve. It is further preferred that the second sensor g 2 has an output characteristic curve which is symmetrical in respect to its sensor center axis.
  • the second sensor g 2 has an output characteristic curve that displays a balanced output.
  • the first sensor g 1 may have an output characteristic curve of the first sensor g 1 displays a balanced output.
  • the first sensor g 1 and the second sensor g 2 preferably have output characteristic curves such that by shifting one of the sensors by a predetermined amount equal to the effective distance L between the center axes of the first sensor and the second sensor in the direction toward the other sensor, the respective sensor output characteristic curves are periodic functions having a phase difference of 90°.
  • the behavior of the sensor output characteristic curves as periodic functions with a phase difference of 90° provides a sensor correlation function with periodic behavior resulting therefrom which is point-symmetrical in relation to the adjustment point.
  • the sensors g 1 , g 2 preferably have output characteristic curves having a square waveform. It is not difficult to obtain sensors having sensor output characteristic curves with a square waveform by means of a diode-based circuit. This also results in sensor correlation functions with a linear path between two respectively adjoining extreme points, but at least between the intersection points with the abscissa, or zero value points, and the adjoining extreme, or maximum value points. This further simplifies the evaluation.
  • a third sensor g 3 having an output characteristic curve similar to that of the second sensor g 2 is disposed within said device such that its effective sensor center axis is coincident with the effective center axis of the first sensor g 1 .
  • a summation circuit is provided for determining a difference between a second sensor signal S 2 and a third sensor signal S 3 , and for forming a difference signal which is used with a first sensor signal for forming the cross-correlation function used as the controller input signal.
  • first sensor g 1 and second sensors g 2 may be arranged such that a distance L between said first sensor g 1 center axis and said second sensor g 2 center axis is such that a maximum value of the sensor correlation function R g1g2 , which adjoins the intersection of the sensor correlation function R g1g2 derived from the product of the sensor output characteristic curves with the abscissa, lies on the ordinate.
  • a signal emitter g 4 may be provided which transmits velocity signals s 4 which are approximately proportional to the yarn velocity, that the signals s 4 of the signal emitter g 4 can be provided to the transit time correlator for range preselection for the lock-on of the control loop circuit on the real intersection of the cross-correlation function ⁇ ( ⁇ ) with the abscissa.
  • a further possibility of preventing the transit time correlator from locking on to a false minimum value of the cross-correlation function ⁇ ( ⁇ ), even with greater velocity fluctuation, consists in using the additional signal emitter g 4 , by means of which the controller is provided with a range preselection for the range in which the adjustment point is located.
  • FIGS. 1a to e illustrate various sensor output characteristic curves of sensors g 1 and g 2 with a plot of the associated sensor correlation function R g1g2 ;
  • FIGS. 2a to e illustrate the associated sensors with the wiring of the diode circuits
  • FIG. 3a illustrates the sensor output characteristic curves of sensors g 1 to g 3 ;
  • FIG. 3b represents a block wiring diagram for a transit time correlator for utilization of the signals s 1 (t) to s 3 (1) generated by the sensors g 1 to g 3 in accordance with FIG. 3a;
  • FIG. 4 illustrates a block wiring diagram for a transit time correlator with an additional sensor g 4 ;
  • FIG. 5 is a graphic representation of cross-correlation functions depending on the texture of the yarn.
  • FIGS. 1a to 1e examples of sensor output characteristic curves with the associated sensor correlation function R g1g2 are illustrated graphically.
  • FIG. 1a A particularly simple example is shown in FIG. 1a.
  • the sensors g 1 and g 2 can be made by appropriately wiring first and second photodiodes illustrated respectively at 1 and 2, in a manner as can be seen in the associated FIG. 2a.
  • the signal s 2 (t) of the sensor g 2 is directly derived from the first photodiode 1 output signal, with the first photodiode 1 disposed upstream in relation to the yarn running direction. It should be presumed that the yarn travel direction is from left to right with respect to the figures. This standard will hold true throughout the following discussion.
  • the signal s 1 (t) of the sensor g 1 is formed by means of an summation circuit 3, wherein a negative signal coming from the first photodiode 1 is combined with a positive signal coming from the second photodiode 2.
  • the designation b/2 represents a reference value for the width of a photodiode.
  • the sensor correlation function R g1g2 is formed from the product of the output characteristic curves of the sensors g 1 and g 2 .
  • the distance between the sensors is defined as the distance of the effective sensor center axes.
  • the effective sensor center axis of the sensor g 2 lies in the center of the first photodiode 1, while the effective sensor center axis of the sensor g 1 lies at the separation line between the photodiodes 1 and 2.
  • the distance L is therefore equal to 1/2 (b/2) or b/4.
  • the position of this intersection point coincides with the intersection of the sensor output characteristic curve of the sensor g 1 .
  • the minimum value of the sensor cross-correlation function is coincident with the instantaneous zero value of the sensor output characteristic curve.
  • the sensor must consist of two signal receivers, in this case the photodiodes 1 and 2, disposed one behind the other in the running direction of the yarn.
  • the effective sensor center axes form the basis for the definition of the distance of the sensors from each other, which on the one hand is based on the calculation of the model delay time ⁇ as well as the velocity, the intersection point of the sensor output characteristic curve of the sensor g 1 with the abscissa, or when the output value goes through zero, in the effective sensor center axis is a prerequisite for the intersection of the sensor correlation function R g1g2 , as well as the cross-correlation function ⁇ ( ⁇ ), with the abscissa, indicating minimum values for both functions. In this manner, this intersection can be used directly, i.e. without any prior differentiation, for determining the adjustment point for the model delay time ( ⁇ ).
  • the sensor correlation function R g1g2 or the cross-correlation function ⁇ ( ⁇ ) also behave point-symmetrically. This is a prerequisite for the suppression of systematic errors based on the surface quality of the yarn when determining the adjustment point.
  • FIG. 1b A variant of FIG. 1a is represented in FIG. 1b which differs from the first variant in that the distance L has been increased from the value illustrated in FIG. 1a.
  • an additional expenditure is associated with this because three photodiodes 4,5,6 must be employed.
  • the sensor output characteristic curve of the sensor g 2 also has a characteristic curve having a balanced output. This is achieved using amplifiers 12,21, which double the signal strength, as can be seen in FIGS. 2c and 2d. The result of this is that the sensor signal from the sensor g 2 s 2 (t) is also free of mean values. Because of that it is possible to omit a high-pass filter in the signal path which would have to be used particularly if the signal should be clipped prior to further processing.
  • a sensor correlation function which is broader than those discussed with the previous examples results in connection with the embodiment represented in FIG. 1e and 2e. While a narrower sensor correlation function R g1g2 is more advantageous in regard to the scattering of the estimated transit time data, the collecting range of the adjustment point is greater, which has advantages in regard to the stability of the control loop circuit.
  • a broad sensor correlation function is of particular advantage if the velocity greatly fluctuates during the time of measuring and if the mean velocity is of interest.
  • the sensor output characteristic curves of the sensors g 1 and g 2 of FIG. 1e using the diode circuit of the photodiodes 22,23,24,25,26,27,28 of FIG. 2e.
  • the photodiode 25 is used for both sensors g 1 and g 2 .
  • the distance L is also possible to select the distance L to be equal to b/2, in which case only five photodiodes would be required for the diode circuit, of which the four photodiodes located downstream in the running direction of the yarn would be respectively used in an analog manner for both sensors g 1 and g 2 .
  • the sensor signals s 1 and s 2 here are also free of mean values due to the amplified outputs of the sensor output characteristic curves.
  • FIG. 3a Another embodiment of the present invention is represented in FIG. 3a by means of the sensor output characteristic curves of sensors g 1 to g 3 .
  • FIG. 3b illustrates the associated block wiring diagram for an associated transit time correlator circuit.
  • the third sensor g 3 is disposed in a manner wherein its output characteristic curve agrees with that of the second sensor g 2 and sensor g 3 is nonetheless arranged in a manner wherein its effective sensor center axis coincides with that of the first sensor g 1 . In this manner, the output characteristic curve of the sensor g 3 is displaced by an amount L in respect to the output characteristic curve of the sensor g 2 .
  • the output signal ⁇ of the integrator 34 acting as a feedback integrator is therefore also equal to zero. In this way and with constant velocity, the delay time ⁇ is not unnecessarily adjusted in a delay circuit 31.
  • the controller output signal ⁇ is also transmitted to a dividing element 35, whereby the value for ⁇ , by which the constant value L is divided, is also readjusted there, if necessary.
  • the respective instantaneous value of the velocity is present at the output of the dividing element 35.
  • FIG. 4 An additional embodiment of the present invention is illustrated with a block wiring diagram in FIG. 4.
  • a sensor g 4 is employed which generates an output signal sequence s 4 (t).
  • the sensor g 4 is essentially a pulse sensor 40, by means of which pulses are received from a drive drum 41 for a bobbin 43.
  • the drive drum 41 can have a field spider to which stationary Hall sensors are assigned. Thereby, a number of pulses corresponding to the number of poles of the field spider are generated during a revolution of the drive drum 41.
  • This signal sequence s 4 (t) is counted in a counter 44.
  • the time-dependent counting results are then issued to a digital range comparator 45 which is supplied with the controller output signal ⁇ from the output of the integrator 46.
  • the output of the range comparator 45 is connected with the integrator 46, in which a range preselection for the position of the adjustment point takes place. Therefore, it is possible to effectively prevent the control loop circuit from locking on an intersection of the cross-correlation function ⁇ ( ⁇ ) with the abscissa, or minimum value thereof, which does not correspond to the sought adjustment point. It is possible to additionally supply this range comparator 45 with an offset entry capability, not shown here, by means of which the width of the range can be set.
  • the signal of the sensor g 4 is not very exact due to the slippage between the drive drum 41 and the bobbin 43, it is sufficient for a range preselection for the integrator of the transit time correlator. In this manner, the correct adjustment point is immediately found with practically no increase in computing capacity requirements, even at higher velocity changes.
  • the analog signals s 2 and s 1 are digitized by triggers 36 and 38, and are quantized to one bit.
  • the computing outlay is small, so that an 8-bit micro-controller is sufficient for adjusting the pattern transit time ⁇ .
  • the integrator 46, the range comparator 45, the delay member 37 and the multiplier 39 have been replaced by digital components.
  • the delay member 37 can be replaced by a shift register, while the multiplier 39 is a phase detector.
  • a dividing element 47 and a further integrator 48 are also digital.
  • the yarn length wound on the bobbin tube is cumulatively determined in the integrator 48 on the basis of the velocity and the winding time. In this way it is possible to determine the yarn length wound on the bobbins with heretofore unrealized accuracy.
  • FIG. 5 illustrates a plot of cross-correlation functions generated in accordance with the sensor output characteristic curves and sensor arrangements according to the present invention. It can be seen here that the slope of the cross-correlation function changes with the bandwidth of the texture of the yarn (critical frequency f 1 ⁇ f 2 ⁇ f 3 ). This dependence of the slope of the cross-correlation function, however, is considerably less than with the transit time correlation using the differentiated correlation function. This has very positive effects on the stability of the control loop circuit in respect to variable textures, because the changes of the slope of the cross-correlation function directly result in a proportional change of the loop amplification of the adjustment control loop circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US08/533,071 1994-09-24 1995-09-25 Device for determining the velocity of a longitudinally traveling elongate textile material, especially a yarn, using electronic sensors Expired - Fee Related US5652509A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4434234A DE4434234C2 (de) 1994-09-24 1994-09-24 Vorrichtung zum Bestimmen der Geschwindigkeit eines in Richtung seiner Längsausdehnung bewegten Textilgutes, insbesondere eines Textilfadens
DE4434234.9 1994-09-24

Publications (1)

Publication Number Publication Date
US5652509A true US5652509A (en) 1997-07-29

Family

ID=6529149

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/533,071 Expired - Fee Related US5652509A (en) 1994-09-24 1995-09-25 Device for determining the velocity of a longitudinally traveling elongate textile material, especially a yarn, using electronic sensors

Country Status (5)

Country Link
US (1) US5652509A (it)
JP (1) JP4037922B2 (it)
CH (1) CH693618A5 (it)
DE (1) DE4434234C2 (it)
IT (1) IT1277637B1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5823460A (en) * 1996-06-26 1998-10-20 W. Schlafhorst Ag & Co. Method and device for determining the diameter of a textile yarn cheese
GR1003684B (el) * 2000-11-09 2001-10-03 Νικολαος Καλαιτζης Μεθοδος και συσκευη μετρησης μηκους και ταχυτητας παραδοσεως νηματος με χρηση ζευγους οπτικων αισθητηρων και προσαρμοστικου ψηφιακου ετεροσυσχετιστη σηματων.
WO2004034065A1 (en) * 2002-10-11 2004-04-22 The Timken Company Speed sensing method and apparatus
US20070084957A1 (en) * 2005-10-13 2007-04-19 Savio Macchine Tessili S.P.A. Device and process for the precision measurement of the length of thread wound onto a bobbin

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2774467B1 (fr) * 1998-02-03 2000-03-31 Fil Control Capteur sans contact pour mesurer la longueur d'un fil, procede de mesure utilisant ce capteur et dispositif pour la mise en oeuvre du procede
DE10310178A1 (de) * 2003-03-08 2004-09-16 Saurer Gmbh & Co. Kg Verfahren und Vorrichtung zum Messen der Garngeschwindigkeit
JP4045444B2 (ja) * 2004-01-06 2008-02-13 村田機械株式会社 紡績糸の巻取装置
GB201601213D0 (en) * 2016-01-22 2016-03-09 Mg Sensors Ltd Yarn imaging device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1922461A1 (de) * 1969-04-30 1970-11-12 Inst Foer Mikrovagsteknik Einrichtung zum Messen der relativen Bewegung eines Gegenstandes
DE2544819A1 (de) * 1975-10-03 1977-04-14 Licentia Gmbh Korrelator zur beruehrungslosen messung der geschwindigkeit mit mehreren messfuehlern
EP0000721A1 (de) * 1977-07-22 1979-02-21 b a r m a g Barmer Maschinenfabrik Aktiengesellschaft Vorrichtung zum Aufwickeln von Garn
JPH031321A (ja) * 1989-05-29 1991-01-08 Nec Corp 磁気ディスク媒体
EP0582112A1 (de) * 1992-08-05 1994-02-09 W. SCHLAFHORST AG & CO. Vorrichtung zum Messen der Geschwindigkeit von Textilfäden an einer Wickeleinrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH669777A5 (en) * 1986-02-28 1989-04-14 Richard Allemann Contactless thread length measuring circuit - scans speed proportional signals to derive part length and sums all part lengths to obtain overall length

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1922461A1 (de) * 1969-04-30 1970-11-12 Inst Foer Mikrovagsteknik Einrichtung zum Messen der relativen Bewegung eines Gegenstandes
DE2544819A1 (de) * 1975-10-03 1977-04-14 Licentia Gmbh Korrelator zur beruehrungslosen messung der geschwindigkeit mit mehreren messfuehlern
EP0000721A1 (de) * 1977-07-22 1979-02-21 b a r m a g Barmer Maschinenfabrik Aktiengesellschaft Vorrichtung zum Aufwickeln von Garn
JPH031321A (ja) * 1989-05-29 1991-01-08 Nec Corp 磁気ディスク媒体
EP0582112A1 (de) * 1992-08-05 1994-02-09 W. SCHLAFHORST AG & CO. Vorrichtung zum Messen der Geschwindigkeit von Textilfäden an einer Wickeleinrichtung
DE4225842A1 (de) * 1992-08-05 1994-02-10 Schlafhorst & Co W Vorrichtung zum Messen der Geschwindigkeit von Textilfäden an einer Wickeleinrichtung

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Prof. Dr. Ing. habil. Roland Backmann et al, Beruhrungslose Geschwindigkeitsmessung am laufenden Faden, Melliand Textilberichte, Jul./1993, 639 40. *
Prof. Dr.-Ing. habil. Roland Backmann et al, "Beruhrungslose Geschwindigkeitsmessung am laufenden Faden," Melliand Textilberichte, Jul./1993, 639-40.
Werner Ringens et al, "Optoelektronischer Sensor zur beruhrungslosen Geschwindigkeitsmessung an textilen Oberflachen," Textil Praxis International, Jun. 1988.
Werner Ringens et al, Optoelektronischer Sensor zur beruhrungslosen Geschwindigkeitsmessung an textilen Oberflachen, Textil Praxis International, Jun. 1988. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5823460A (en) * 1996-06-26 1998-10-20 W. Schlafhorst Ag & Co. Method and device for determining the diameter of a textile yarn cheese
GR1003684B (el) * 2000-11-09 2001-10-03 Νικολαος Καλαιτζης Μεθοδος και συσκευη μετρησης μηκους και ταχυτητας παραδοσεως νηματος με χρηση ζευγους οπτικων αισθητηρων και προσαρμοστικου ψηφιακου ετεροσυσχετιστη σηματων.
WO2004034065A1 (en) * 2002-10-11 2004-04-22 The Timken Company Speed sensing method and apparatus
US20060015288A1 (en) * 2002-10-11 2006-01-19 Xiaolan Ai Speed sensing method and apparatus
US7174269B2 (en) 2002-10-11 2007-02-06 The Timken Company Speed sensing method and apparatus
US20070084957A1 (en) * 2005-10-13 2007-04-19 Savio Macchine Tessili S.P.A. Device and process for the precision measurement of the length of thread wound onto a bobbin

Also Published As

Publication number Publication date
ITMI951958A0 (it) 1995-09-21
IT1277637B1 (it) 1997-11-11
DE4434234A1 (de) 1996-03-28
JPH08105909A (ja) 1996-04-23
ITMI951958A1 (it) 1997-03-21
JP4037922B2 (ja) 2008-01-23
DE4434234C2 (de) 2003-06-26
CH693618A5 (de) 2003-11-14

Similar Documents

Publication Publication Date Title
JP3442431B2 (ja) 巻回装置の繊維糸速度測定装置
US4447955A (en) Method for determining the length of filamentary materials, such as yarn, wound upon a cross-wound package by means of a friction drive and a grooved drum
US5278555A (en) Single inductive sensor vehicle detection and speed measurement
JP2735605B2 (ja) 綾巻きパッケージのパッケージ円周を求め、かつ結果を利用するための方法および装置
US5652509A (en) Device for determining the velocity of a longitudinally traveling elongate textile material, especially a yarn, using electronic sensors
US5060881A (en) Process for the winding of warp beams
US5074480A (en) Process and apparatus for determining the yarn speed on textile machines
US5371460A (en) Speed and direction sensor for a rotating shaft having a rotor with teeth of alternating widths
US5823460A (en) Method and device for determining the diameter of a textile yarn cheese
WO2013079530A1 (en) Dynamic belt monitoring apparatus and method
JPH0320796B2 (it)
CN101501490B (zh) 基于激光多普勒测速法确定运行线的纱线质量和/或卷轴质量的方法和装置
CA2043839A1 (en) Method for measuring a length and electronic slide caliper
US4373266A (en) Equipment for continuously measuring the length of an endless material being wound up into a circular package
Schwarz et al. Increasing signal accuracy of automotive wheel-speed sensors by online learning
CN100422745C (zh) 无接触测定一根运动中的纱线速度的方法和装置
US5977764A (en) Method to sense speed, direction and acceleration for a rotating shaft using a rotor with unequal tooth spacing
JP3056904B2 (ja) ジェットルームにおける緯糸速度計測装置及び緯入れ状態監視装置
US5433122A (en) Method of measuring the length of winding material running onto a winding beam
JP2021505872A (ja) 回転数測定のための勾配決定
KR20200065953A (ko) 롤의 마모 감지 장치 및 이를 이용한 롤의 마모 감지 방법
JPS61136854A (ja) コイル径演算装置
JPH0579123B2 (it)
JPH0545128A (ja) 移動物体の測長方法
JPH02296122A (ja) 磁歪式応力センサによる応力測定方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: W. SCHLAFHORST AG & CO., GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WEIS, MANFRED;REEL/FRAME:007768/0758

Effective date: 19950925

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20050729